Oil burner



June 4, i929. I v. H, mER's' 1,716,325

'- OIL BURNER Filed Oct. 10. 1925 INVENTOR. HOME? 5. APO GEAS,

EW;MMMAM A TTORNEYS.

Patented June 4%, i929.

HOMER s, ROGERS, or mrnwa'oxnnfwrsooNsrN. AssIeNoR 'ro' COMBUSTION FUEL 4 on. BURNER COMPANY,

coNsrN. a

on MILWAUKEE, wIscoNsn coRPoRA'noN or WIS- I OIL BURNER,

Applicationfiled October 10, 1925. seria No. 61,733.

This invention relates to improvements in oil burners wherein oil is atomized by air under pressure, and more particularly to means operable by the compressed air for automatically controlling the oil supply to the burner. v c

As an added safety in the operation of oil burning apparatus 'suchas is now quite .widely used for heating dwellings and the like, the present invention contemplates an automatic'control operable by the pressure of the atomizing air for controlling the supply of oil to the burner.

One of the principal objects of the present invention resides in the provision of, a burner of the class referred to wherein the supply of 'oil to 'the oil nozzle is rendered entirely dependent upon a proper and suf ficient flow. of the atomizing air.

Another object is to provide an oil burner of the atomizing type whichshall include automatically operable means for preventing the flow of oil until air under proper operating pressure is first supplied to the burner nozzle.

Another object is to incorporate a control such as described directly as a part of the burner, thus providing for quick and easy installation, accessibility for purposes of adj ustment, repair'and the like.

Another object is to provide an improved oil burner of the character referred to which is constructed as a unit and which includes a fluid-pressure motor for controlling the flow of oil to the oil nozzle, the motor being-responsive to the pressure of atomizing air and acting. to entirely shut off the oil supply to the oil nozzle when the air pressure falls belowa predetermined value.

Another object is to provide an improved oil burner of the character referred 'to which is simple in construction and operation and which may be manufactured at a comparatively small cost.

Other objects and advantages will hereinafter appear.

For the purpose of illustrating the invention an embodiment thereof is shown in the drawings, in which Figure-1 is a central, longitudinal section through the improved oil burner Fig. 2 is a fragmentary, sectional view of a modified form; and

Fig. 3 is an end elevation of the modified oil nozzle in Fig. 2, looking toward the right.

- Referring to Fig. 1, the burner is shown as comprising a casing 1 provided with an air passage 2 communicating with a compressed air supply connection 3 and an oil passage 4 communicating with an oil supply connection 6 5, the portion of easing 1 separating passages 2 and 4 and receiving the inlet end of an oil nozzle 7. An air nozzle 8 is threaded into one end of casing 1, the air nozzle fitting'over and being spaced from oil nozzle 7 to provide an air passage 9 which communicates with air passage 2.

Portion 6 of easing 1 is provided with an opening 10 communicating with the inlet end of o1l nozzle 7 and oil passage 4, opening 10 7 being controlled by a needle valve 11 arranged 1n casm 1 in axial alignment with nozzle 7.

Smta' le packing 12 surrounds valve 11 and is confined between a ring 13 and a ring 14, the latter resting against ashoulder 15 in casing 1. A spring 16 is arranged on valve 11 between ring 13 and a nut 17 threaded into casing 1, as shown, whereby the spring is held compressed and acts to hold packing 12 compressedsufliciently to prevent the fiow of oil from passage 4 along valve 11 while permitting free axial movement of the latter in casing 1 to completely close opening 10 to cut off the supply of oil from connection 5 to oil nozzle 7 or to open sufficiently to permit'the 5 required amount of oil to flow to nozzle 7 Casing 1 is provided with a fluid-pressure motor, designated generally by the reference numeral 18 andco-mprising an air chamber 19 having a wall 20 which may be formed or cast integrally with casing 1 and a 'wall 21 which is in the form, of a removable member fitted against wall 20 and secured thereto by means of bolts 22, and a flexible diaphragm or pressure element 23 arranged in chamber 19 between the walls 20 and 21 thereof. The end 24 of valve 11 is threaded and passes'through diaphragm 23 and a stiffening member or metal disc 25, nuts 26 and 27 being threaded upon end 24 of valve member 11 and arranged on either side of diaphragm 23 whereby valve 11 is connected to the latter for movement therewith. Nuts 26 and 27 may be adjusted so that valve 11 is in a position to the left to completely close opening 10 when diaphragm 23 is in its normal position, as shown in Flg. 1, a spring 28 being arranged in pressure chamber 19 between wall 21 thereof and diaphragm 23 whereby the spring acts upon the right side of the diaphragm to normally urge valve 11 to the left and to hold the same in position to completely close opening 10.

A stem'29 is threaded into Wall 21 and is provided with an axial bore for loosely receiving end 24 of valve 11, stem 29 being ad- ]usted to engage nut 27. to limit movement or to the air pressure present in air passage 2.

The operation of the improved oil burner is as follows: Spring 28 normally a-cts to urge valve 11 to the left to completely close opening 10, the spring beingof suflicient stiifness to prevent movement of diaphragm 23 to the right to cause opening of valve 11 by 1 air pressure in air passage 2 which would be insufiicient to atomizeoil which might be per mitted to issue from oil nozzle 7. The deslgn of the individual parts and eneral ar rangement thereof is such that w en the air 23 to the right against the action of spring 28; to open valve 1]., stem 29 engaging nut 27 to pressure in passage 2 is suflicient to atomize the 011 issuing from nozzle 7 this air pressure is suflic1ent to effect movement of diaphragm revent movement of valve 11 to the right eyond that required to permit the proper amount of oil to flow from passage 4 to nozzle 7 by way of opening 10.

From the foregoing it will be seen that the fluid-pressure motor 18 isresponsive to the pressure of the atomiz'ing air in passages 2 and 9 in such manner that the oil is permitted to flow to nozzle 7 only when the pressure of the air is sufiicient to atomize the oil, and that should the air pressure fail or fall to such point as to be insufiicient to properly atomize oil which might issue from nozzle 7, valve lI automatically closes under the action of spring 28. It Will also be'noted that the valve 11 is normally closed and that therefore no oil can issue from the burner when starting up until air under proper working pressure is first supplied thereto. It will further be seen that an improved oil burner of the atomizing type has been provided with the means or fluid-pressure motor 18 associated directly with the burner and adapted to automatically control the oil supply valve 11. It will also be noted that nuts 26 and 27 screwthreadcdly engaging the outer end of valve 11 on either side of the diaphragm, and stem 29 and its lock nut 31are so arranged and incorporated as to cojointly afford means whereby movement of the valve with respect to its seat may be very accurately regulated and adjusted.

In the construction shown in Fig. 1,. the tip or head- 35- of oil nozzle 7 is spaced an apprein order to maintain combustion.

ciable distance from the tip 36 of air nozzle 8 whereby air is permitted to flow freely along passage 9, around head 35 and out through:-

opening 37 in the tip of the air nozzle. In this construction the combustion of the oil spray is not self-sustaining, it being necessary to employ'auxiliary ignition playing into the oil spray asfit issues from the'tip or nozzle 8 i For the purpose of providing a self-sustaining nozzle for use where auxiliary ignition is either not feasible -or not desired, the tip or'head of the oil nozzle may be constructed and ar- I ranged as shown in Figs. 2'and 3. The head 38 of the oil nozzle 39 is arranged against the head 40 of air nozzle 41 and is providedwith a number of angularly disposed grooves 42 through which the air is forced to flow,

grooves 42 causing the air and the atomized oil to issue from the opening 43 in head 40 of the air nozzle at an angle to the axis of noz-' zle 7, producing a self-sustaining flame of brush type.

A preferred embodiment of the invention has been shown and described, but of course various changes may be adopted in the size, shape and arrangement of the parts Without departing from the spirit of the invention or thescope of the claims. p

The invention claimed is:

1. In an oil burner, acasing having a port- .whatis commonly known as a flame of the ed. partition defining an air chamber and an 7 oil chamber therein, said casing having an.

outlet port leading from the air chamber, an air nozzle connected with said outlet port, said outlet port being opposed to the ported partition, an oil nozzle connected to the ported partition and extending through the air nozzle, means for supplying air under-pres sure to the air chamber, meansv for supplying oil under pressure to the oil chamber, a valve carried by the casing and cooper-able with the port of the partition to regulate the flow of oil therethrough to the oil nozzle,- and a fluid pressure motor mounted 0 the casing and connected with the valve, 831d casing having a ,passa e leading from the air chamber to the flui pressure motor. 7

2. For use in an oil burner, a casing, a partition in the casing defining an air chamber and an oil chamber therein, said casing having an inlet port and an outlet port for the air chamber and an inlet port for the oil chamber, said partition having an outlet port for the oil chamber, an air nozzle connected to the outlet port for the air chamber, an oil 7 nozzle connected to the outlet port for the oil chamber, a valve carried by the casing and co-operable with the outlet port of'the oil chamber to regulate the flow of oil therethrough to the oil nozzle, a flange on said casing for securing a fluid pressure motor to the casing in'such a Way that it may operate said valve, said casing having a "passage leading from the air chamber to the surface of said flange.

3. In an oil burner, a casing, an air chamber and an oil chamber therein, said casing having an inlet port and an outlet port for the air chamber, an inlet port and an outlet port for the oil chamber, a valve for opening and. closing the outlet port for the oil chamber, a fluid pressure motor mounted on the casing for operating said valve, said casing having a passage leading from the air chamher to the fluid motor.

4. An oil burner comprising a casing having an air chamber, an air nozzle leading from the air-chamber and having free, open and direct communication therewith, an oil nozzle in co-operative relation to the air nozzle, a valve controlling the supply of oil to the oil nozzle, a fluid pressure motor mounted directly on the casing-said casing having a passage leading from the air chamber to the fluid pressure motor whereby the motor is actuated by the air pressure in the air chamber andconsequently by the air pressure at the nozzle to open the valve when the air pressure at the nozzle is sufficient to atomize the oil, said fluid pressure motor having means co-acting therewith to close the valve when the air pressure acting on the motor is insufficient to properly atomize the oil.

In Witness whereof I hereto aflix my signature.

HOMER S. ROGERS. 

